Fix 11053: Integer division by zero in calculate.h (#4092)

* Fix 11053: Integer division by zero in calculate.h

* Format

Author: pfultz2

lib/calculate.h

@@ -69,7 +69,7 @@ R calculate(const std::string& s, const T& x, const T& y, bool* error = nullptr)
         }
         return wrap(x / y);
     case '%':
-        if (isZero(y)) {
+        if (isZero(MathLib::bigint(y))) {
             if (error)
                 *error = true;
             return R{};

test/testvalueflow.cpp

@@ -6519,6 +6519,20 @@ class TestValueFlow : public TestFixture {
 
         code = "void f(const char * const x) { !!system(x); }\n";
         valueOfTok(code, "x");
+
+        code = "void setDeltas(int life, int age, int multiplier) {\n"
+               "    int dx = 0;\n"
+               "    int dy = 0;\n"
+               "    if (age <= 2 || life < 4) {\n"
+               "        dy = 0;\n"
+               "        dx = (rand() % 3) - 1;\n"
+               "    }\n"
+               "    else if (age < (multiplier * 3)) {\n"
+               "        if (age % (int) (multiplier * 0.5) == 0) dy = -1;\n"
+               "        else dy = 0;\n"
+               "    }\n"
+               "}\n";
+        valueOfTok(code, "age");
     }
 
     void valueFlowHang() {